List of top Chemistry Questions

Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching?

The correct order of $C-O $ bond length among $CO,CO_3^{2-}$, $CO_2$ is

The correct order of increasing thermal stability of $K_2CO_3, MgCO_3, CaCO_3 $ and $ BeCO_3$ is

The efficiency of a fuel cell is given by

The Langmuir adsorption isotherm is deduced by using the assumption :

The product formed in Aldol condensation is

With which of the following electronic configuration of an atom has the lowest ionisation enthalpy?

Identify the correct order of the size of the following.

Consider the following compounds: (i) $C_6H_5COCl$ The correct decreasing order of their reactivity towards hydrolysis is:

For the following: (a) $I^-$ (b) $Cl^-$ (c) $Br^-$ The increasing order of nucleophilicity would be:

Which of the following oxidation states are the most characteristics for lead and tin respectively?

In ${TeCl4}$ the central atom tellurium involves

0.3 g of an acid is neutralised by 40 $cm^3$ of 0.125 N NaOH. Equivalent mass of the acid is

Which one of the following is not ferromagnetic?

Oxygen molecule is

Fog is a colloid consisting of

A process is spontaneous at a given temperature if

5 g of $CaCO_3$ completely reacts with

Coordination number of caesium in caesium chloride is

An example for a face centred cubic lattice is

Bakelite is manufactured by using a mixture of

Which one of the following is a homogeneous catalysis?

The solubility of $ AgCl $ is $ 1 \times 10^{-5}\, mol/L $ . Its solubility in $ 0.1 $ molar sodium chloride solution is

What will be the bond angle C-0-H in alcohol if hybridisation of C and O atom possess sp$^3$hybridisation?

AgCl dissolves in a solution of NH₃, but not in water because